Android下载网络文本

具体的界面如下图所示

Android下载网络文本

从浏览器上下载文本文件到手机中，具体的步骤如下：

1、新建一个工程名为GetTxtData的项目；

2、修改res/layout/fragment_main.xml文件，具体代码如下：

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     android:paddingBottom="@dimen/activity_vertical_margin" 6     android:paddingLeft="@dimen/activity_horizontal_margin" 7     android:paddingRight="@dimen/activity_horizontal_margin" 8     android:paddingTop="@dimen/activity_vertical_margin" 9     tools:context="com.example.gettxtdata.MainActivity$PlaceholderFragment" >10 11     <LinearLayout 12         android:layout_width="fill_parent"13         android:layout_height="fill_parent"14         android:orientation="vertical"15         >16         <EditText 17             android:id="@+id/inputText"18             android:layout_width="fill_parent"19             android:layout_height="wrap_content"20             android:text="http://www.sohu.com"21             />22         <Button 23             android:layout_width="wrap_content"24             android:layout_height="wrap_content"25             android:id="@+id/getTxtBtn"26             android:text="获取文本"27             />28         <ScrollView 29             android:layout_width="fill_parent"30             android:layout_height="fill_parent"31             >32             <TextView android:layout_width="fill_parent"33                       android:layout_height="wrap_content"34                       android:id="@+id/sohu"35                 />36         </ScrollView>37     </LinearLayout>38 39 40 </RelativeLayout>

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3、新建一个名为NetTool.java的类，该类主要是操作文本的，类中添加的方法如下所示：

 1 public static String getHtml(String path,String enconding)throws Exception{ 2         //建立url类对象，抛出异常 3         URL url=new URL(path); 4         //得到HttpURLConnection对象 5         HttpURLConnection conn=(HttpURLConnection)url.openConnection(); 6         conn.setRequestMethod("GET");//声明请求方式 7         conn.setConnectTimeout(6*1000);//设置链接超时 8          9         if(conn.getResponseCode()==200)10         {11             InputStream iStream=conn.getInputStream();//得到输入流12             byte[] data=readInstream(iStream);//得到数据13             14             //将字节转化为字符串15             return new String(data,enconding);16         }

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4、修改MainActivity.java代码，代码如下：

 1 public class MainActivity extends ActionBarActivity { 2  3     @Override 4     protected void onCreate(Bundle savedInstanceState) { 5         super.onCreate(savedInstanceState); 6         setContentView(R.layout.activity_main); 7  8         if (savedInstanceState == null) { 9             getSupportFragmentManager().beginTransaction()10                     .add(R.id.container, new PlaceholderFragment()).commit();11         }12     }13 14     @Override15     public boolean onCreateOptionsMenu(Menu menu) {16 17         // Inflate the menu; this adds items to the action bar if it is present.18         getMenuInflater().inflate(R.menu.main, menu);19         return true;20     }21 22     @Override23     public boolean onOptionsItemSelected(MenuItem item) {24         // Handle action bar item clicks here. The action bar will25         // automatically handle clicks on the Home/Up button, so long26         // as you specify a parent activity in AndroidManifest.xml.27         int id = item.getItemId();28         if (id == R.id.action_settings) {29             return true;30         }31         return super.onOptionsItemSelected(item);32     }33 34     /**35      * A placeholder fragment containing a simple view.36      */37     @TargetApi(Build.VERSION_CODES.GINGERBREAD)38     public class PlaceholderFragment extends Fragment {39 40         public PlaceholderFragment() {41         }42 43         @Override44         public View onCreateView(LayoutInflater inflater, ViewGroup container,45                 Bundle savedInstanceState) {46             View rootView = inflater.inflate(R.layout.fragment_main, container,47                     false);48             StrictMode.setThreadPolicy(new 49                      StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());50                              StrictMode.setVmPolicy(51                      new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());52 53             54             final EditText inputText=(EditText)rootView.findViewById(R.id.inputText);55             final Button getBtn=(Button)rootView.findViewById(R.id.getTxtBtn);56             final TextView txtView=(TextView)rootView.findViewById(R.id.sohu);57             58             getBtn.setOnClickListener(new View.OnClickListener() {59                 60                 @Override61                 public void onClick(View v) {62                     // TODO Auto-generated method stub63                     String path=inputText.getText().toString();64                     try65                     {66                         String html=NetTool.getHtml(path, "GBK");67                         txtView.setText(html);68                         69                         Toast.makeText(MainActivity.this, 70                                 "获取文本成功", Toast.LENGTH_LONG).show();71                     }catch(Exception e)72                     {73                         Toast.makeText(MainActivity.this, 74                                 "获取文本失败", Toast.LENGTH_LONG).show();75                         e.printStackTrace();76                     }77                 }78             });79             return rootView;80         }81     }82 83 }

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5、修改AndroidManifest.xml代码，在</application>标签后加上如下代码：
<uses-permission android:name="android.permission.INTERNET"/>

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